渠系分流口区域水流运动特性数值模拟

为分析渠系分流口区域的水流运动特性,通过观测室内模型试验水流运动现象,利用RNGκ-ε紊流模型并借助FLOW-3D软件,建立了分流角为73°的渠系分流口区域的水力特性分析计算模型。通过对比分析数值模拟结果与试验结果,验证了该分析计算模型的准确性和可靠性。以建立的数学模型为分析计算平台,分析了渠系分流口近区及口门断面不同工况下的多个水力要素,重点介绍了不同单宽流量比情况下,渠系分流口区域回流区长度与宽度及引水支渠进水断面收缩系数的变化规律。分析结果表明,随单宽流量比的增大,分流口区域回流区范围增大,支渠渠道进水断面收缩系数减小。研究成果可为类似工程规划设计提供参考。

Numerical Simulation of Water Movement Characteristics of Bifurcation Area in Canal System

In order to analyze the water movement characteristics of bifurcation area in canal system, through the observation of water movement of indoor model test, the calculation model was established to analyze the hydraulic characteristics of bifurcation area where the division angle was 73°, based on the RNG turbulence model and FLOW-3D software. By comparing calculation results with model test, the accuracy and reliability of the calculation model was verified. Through the mathematical model, several hydraulic factors of bifurcation area in canal system and cross section of entrance in different conditions were analyzed, especially the change law of length and width of recirculation zone of bifurcation area in canal system and the variation of contraction coefficient of branch canal inlet section were discussed in different ratio of unit width discharge. The results show that the range of recirculation zone of bifurcation area increases and the contraction coefficient of branch canal inlet section decreases with the increase of ratio of unit width discharge. The research findings can provide reference for design of similar projects.